Eureka calls this grinder Casa, which means home. And the name, we think, doesn't point to the grinder's strongest area of use. The W65 Casa is a grind-by-weight grinder with a 65-mm Atom burr set, it's large, powerful, and fast, and at around 1,000 euros it costs surprisingly little for what it can do. Only, in our opinion, it's not really a grinder for the living room. We measured it according to our test protocol for espresso grinders, and a single value determines who it's suited for: the retention. Michel and I didn't quite agree on this grinder. But one thing at a time.
As always, we purchased the grinder ourselves. All measured values come from our KM test protocol for espresso grinders. We tested and tasted with our Apas Espresso, the dry-processed coffee from Brazil from the APAS cooperative, which we know from countless tests.
A Small Atom in a Plastic Jacket
At its core, the W65 Casa is a Eureka Atom, just built a bit more simply. Money is saved on the housing: the display attachment is made of plastic, and the supplied hopper isn't the most expensive component either. Everything else is massive and high-quality workmanship. We particularly like the portafilter holder. It can be adjusted with two Phillips screws, and really every portafilter fits in, even the tall, angled Maro, because the grinder has enough height. Where exactly Eureka saved money doesn't really matter in everyday use. For around 1,000 euros, you get a lot of grinder here.
It is large, however. With the small hopper, we measure 43 centimeters in height, plus 18 centimeters in width and 19 centimeters in depth. The plug is on the side and doesn't increase the depth. If you put the large hopper on it, it grows noticeably taller. If you want to place it under a wall cabinet, you should measure first. The 10 kilograms of weight ensure that nothing wobbles when grinding.
65-mm Atom Burr Set and Grind by Weight
The centerpiece is a 65mm flat burr made of hardened steel, the classic Atom burr. It's powered by a motor with around 280 watts, which is the smaller variant compared to the large Atom W 65 with 430 watts. This makes little difference to the grinding performance. For 18 grams, the grinder takes 10.5 seconds according to the protocol, but with dark, brittle beans it drops to seven to eight seconds in practice. In 10 seconds it produces 30 grams. A solid average that's already on the faster end.
The real attraction is Grind by Weight. A scale sits in the portafilter fork that weighs while grinding and stops the motor exactly at the target weight. You hang in the portafilter, the grinder tares and starts grinding until the programmed amount is in the basket. No button, no external scale, no time estimation. Up to three portions can be stored, plus a manual mode. For commercial use, this is worth its weight in gold, and we'll come back to that shortly.
As with the old Mignon Specialità, the adjustment wheel is small and difficult to fine-tune. One click changes the extraction in rather large steps and there's a lot between the detent points. We've been wishing Eureka for years to have a larger wheel across their entire portfolio. That would be a bigger advancement than many new models. Clever tinkerers are already 3D-printing adapters for it.
Fast, quiet, and still cool
Despite its speed, the Casa remains quiet. We measure 79.6 decibels, making it one of the quieter grinders in the field. Speed and noise levels don't come at the expense of each other here, which isn't a given. Thermally there's nothing to complain about either. The ground coffee stays at around 29 degrees on average, keeping it below the threshold where heat damages the coffee. Even under load, the grinder doesn't heat up. This is exemplary and one of the reasons why it handles many shots in succession without issues.
Consistency: for a GBW slightly too much play
This is where the first weakness shows, and it appears exactly where you wouldn't expect it with a GBW. Over 15 grinds, the standard deviation is 0.21 grams. We aim for 18 grams and sometimes land at 17.7, sometimes at 18.2. That's acceptable, but from a grinder with an integrated scale we'd expect more. Time-dosed grinders with clean calibration are sometimes more precise.
So why Grind by Weight at all? Because the advantage lies elsewhere. In commercial use, you constantly adjust the grind throughout the day because humidity and beans change. With time dosing, you'd have to readjust the time each time and reweigh. With GBW there's only one adjustment screw: the grind setting. The grinder handles the amount. And then 17.7 or 18.2 grams, while not perfect, is still much closer to the target than if you suddenly find yourself at 17 grams with a shifted time setting.
The retention: 19 grams - WAY TOO MUCH
Now to the point that decides everything for us. The absolute retention is 19.3 grams. Only 0.9 grams of that is permanent; the bulk of 18.4 grams is temporary retention. This is ground coffee that remains in the grinder after grinding and waits to be thrown out next time. In other words: there's constantly a whole double espresso sitting in the grinder, a kind of emergency reserve. Switzerland had established a coffee stockpile for times of crisis. Think of the W65 Casa as a small private version of that.
In operation, this means: if you want to pull the first shot in the morning, you first have to grind out a proper double portion to clear the retention before fresh coffee comes through. If you've let the grinder sit for a few hours, you'd otherwise grind old, oxidized coffee into the basket. At home, that's a real loss, day after day. In commercial use, the math looks different. If coffee regularly runs through it, say at least one shot per hour, the temporary coffee never sits in the grinder long enough to age. Then the large retention practically plays no role anymore.
The permanent portion of 0.9 grams is pleasantly small. So hardly any coffee accumulates permanently in crevices. This also means: once you've ground out the temporary retention, you can subsequently work well with cleaning pellets and don't have to constantly disassemble the grinder.
This also makes it clear what the W65 Casa is not: a single-dosing grinder. If you fill in 18 grams of beans and grind them out, around 18 grams remain in the grinder. With single dosing you're essentially just swapping out the retention. For a clean bean change that's sufficient, but not for gram-accurate single dosing. Eureka specifies the grinder for a maximum of one kilo of coffee per day. We don't know why the manufacturer is so cautious, since the Atom burr is otherwise used in commercial grinders. We suspect it's more about distinguishing itself from the more expensive models.
Because the Casa only opens with tools, there's hardly a way around cleaning granules for interim cleaning. You put it in the empty bean hopper, let it grind through, and grind a portion of fresh beans afterward, all without screws. Our Cafetto Grinder Clean consists of 100 percent natural ingredients, is certified organic, and costs 14.90 euros. This keeps the burrs and retention area free from old oils and residue, and the first coffee tastes fresh again.
Reliably returns after adjustment
If you adjust the grind frequently, you want to trust that you can return to the same point afterward. In the adjustment test, we went from the espresso setting to ristretto, then to lungo, and back to espresso. The x50 value is at 167 micrometers at the starting point and 175 upon return; the main peak shifts from 203 to 212 micrometers. These deviations are small. The grinder reliably returns to its setting.
Particle distribution and taste: lots of body, little elegance
We measured and tasted using our standard recipe with the Apas espresso.
In the cup, the Casa shows an espresso with noticeably lots of sweetness and lots of body. It's strong, smooth, and balanced. What it lacks is some clarity. It doesn't show the final differentiation that the coffee would actually be capable of.
We analyze the particle distribution in cooperation with the Coffee Excellence Center at ZHAW on the Retsch Camsizer X2. At espresso setting, the median (x50) is around 167 micrometers, with the main peak at a narrow 203 micrometers. So narrow that the grinder would theoretically also be suitable for light, complex coffees. At the same time, the fine particle content is very high at over 42 percent. Some of this is likely due to the large retention, because the coffee experiences a lot of friction in it and may be ground twice.
This combination explains the taste. The high fine particle content pushes body and sweetness to the forefront and masks the finer, clearer notes. The narrow main peak ensures that the high fine particle content doesn't hurt the coffee. The espresso doesn't tip into bitterness despite a certain dustiness. In practice, this means: The W65 Casa is in its element with medium roasts that tend toward nutty chocolatiness without being over-roasted. It also does well with darker roasts. With very dark coffees, we'd be careful—things can slip into a harsh, scratchy bitterness. And for delicate, acid-forward coffees, it's not the first choice despite the narrow peak.
Casa versus gastro: comparison with the Fiorenzato All Ground Sense
We pitted the W65 Casa directly against the Fiorenzato All Ground Sense, a GBW grinder with 64mm burrs in the same league. We see both grinders more in the entry-level gastro, catering, or club segment than in the classic kitchen at home.
In terms of consistency, the Fiorenzato has a slight edge—at around 0.1 gram deviation, it's about 0.1 gram more precise than the Eureka. The bigger difference is the retention: While the Casa drags along 19.3 grams absolutely, the Fiorenzato is just under 7 grams, so less than half. The Fiorenzato also plays to its strength when opening for cleaning. It practically unscrew itself without tools, whereas with the Eureka you need to reach for tools.
The Eureka counters with volume and operation. At 79 to 84 decibels, it's noticeably quieter. And it grinds completely automatically as soon as the portafilter is in place, without you pressing a button. With the Fiorenzato, that's one more manual step, and in gastro everyday work, every step counts. Neither gets warm by the way—both stay around 30 degrees.
Taste-wise, both are on par; they just go in different directions. The Fiorenzato has a somewhat narrower main peak and less fine particles; its espresso tastes more structured and clearer, with less body. That works well with fruity and lighter coffees. The Eureka delivers more body and sweetness and feels most at home with medium roasts.
| Criterion | Eureka W65 Casa | Fiorenzato All Ground Sense |
|---|---|---|
| Burrs | 65 mm Flat | 64 mm Flat |
| Consistency (Std Dev) | 0.21 g | approx. 0.1 g |
| Absolute Retention | 19.3 g | approx. 7 g |
| Volume | 79 dB | 84 dB |
| Operation | starts automatically | start button required |
| Opening / Cleaning | tool required | tool-free |
| Grind size adjustment | stepped, small wheel | stepless, small range |
| Character in the cup | body, sweetness | clarity, structure |
In the end, we didn't quite agree. Michel would go for the Eureka, especially for lungo-heavy operations and when volume is high. He gets on well with the small adjustment wheel. I lean more toward the Fiorenzato. The detailed comparison will be available in a video soon.
Conclusion
The Eureka Atom W65 Casa is a high-quality, fast, and quiet grind-by-weight grinder at a fair price. It just has the wrong name. Casa stands for home, and that's exactly where we see it least. The temporary retention of over 18 grams forces you at home every morning to throw away a double dose. Nobody wants that.
In gastronomy, the picture changes. There, retention is a non-issue as long as coffee runs regularly, and then you get for around €1,000 a package that's hard to beat: 65mm Atom burrs, grind by weight, quiet, cool, and fast enough for up to two kilos per day, split across two grinders. For small cafés, catering, or the club, that's a lot of grinder for your money.
So for whom? For gastro setups with steady throughput that are looking for an affordable GBW and run medium to darker roasts. For whom not? For the classic kitchen island at home, unless you really consume half to a full kilo per day or live in a shared flat with high coffee throughput. And whoever loves delicate grind size work will chafe at the small adjustment wheel. Bottom line: a clear recommendation, but just not for the address on the nameplate.
Test results: Eureka Atom W65 Casa
Rating according to the KM test protocol for espresso grinders. All measured values collected by us. The permanent retention is green, the temporary and absolute retention as well as the single-dosing performance are red: The grinder retains almost an entire double shot during grinding, which is the core criticism for home use. Particle distribution is intentionally not color-coded in the rating because it is roast-dependent.
Technical Specifications at a Glance
| Property | Value |
|---|---|
| Price | approx. 1,000 euros (as of August 2026) |
| Burr set | 65 mm flat burr (Atom), hardened steel |
| Motor | approx. 280 W |
| Operating mode | Doser grinder with Grind by Weight (not a single-dosing grinder) |
| Grind setting adjustment | stepped, small adjustment wheel |
| Grinding speed | 30 g / 10 sec · 10.5 sec for 18 g (espresso) |
| Noise level | 79.6 dB |
| Grinding temperature | on average approx. 29 °C (stays below the critical threshold) |
| Absolute retention | 19.3 g (18.4 g temporary, 0.9 g permanent) |
| Single-dosing deviation | 18.4 g |
| Consistency (std. dev.) | 0.21 g (target value 18 g) |
| x50 (espresso setting) | approx. 167 µm |
| Fines content (< 100 µm) | approx. 42 % |
| Main peak (espresso) | approx. 203 µm |
| Recommended daily output (manufacturer) | max. 1 kg |
| Weight | 10 kg |
| Dimensions (W × D × H) | 18 × 19 × 43 cm (with small hopper) |
Further Reading
How the W65 Casa stacks up against other grinders is shown in our comprehensive espresso grinder comparison. All grinders with scales have also been compiled in our Grind-by-Weight comparison. And you can find the direct competitor in our review of the Fiorenzato All Ground Sense Plus.
As always, we purchased this grinder ourselves. This review was not requested by Eureka.
